三角柱を挿入したチャネル乱流の流動と熱伝達(流体工学,流体機械)

概要

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Experiments have been performed for a turbulent channel flow obstructed with a triangular cylinder. Two kinds of triangular cylinders with different front edge angle are used. Three clearances between the wall and the triangular cylinder of 1, 2 and 5 mm are tested. The local heat transfer coefficient, the wall static pressure and the wall shear stress are measured. The particle image velocimetry (PIV) has been applied to measure the fluid flow around the triangular cylinder. When the flow field is unsteady because of the existence of the periodically shed vortices, a phase-averaged measurement is carried out. When the clearance is small, the reattachment flow effectively enhances the heat transfer. On the other hand, at large clearance the heat transfer coefficient takes a high value in the location where a large periodic fluctuating motion appears.
2007-07-25